package com.wenzi.yuyin.uitls;

import org.apache.poi.hssf.usermodel.*;
import org.apache.poi.hssf.util.HSSFColor;
import org.apache.poi.ss.util.CellRangeAddress;

import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.List;

public class ExportExcel {
    //显示导出表的标题
    private String title;
    //导出列名
    private String [] rowName;

    private List<Object[]>  dataList = new ArrayList<>();
    HttpServletResponse response;

    public ExportExcel(String title,String[] rowName,List<Object[]> dataList){
        this.dataList=dataList;
        this.rowName=rowName;
        this.title=title;
    }

    /**
     * 导出数据
     */
    public void export(OutputStream out) throws IOException {
        try{
        //创建工作溥对象
        HSSFWorkbook workbook = new HSSFWorkbook();
        //创建工作表
        HSSFSheet sheet = workbook.createSheet(title);
        //产生表格 标题行
        HSSFRow rowm = sheet.createRow(0);
        HSSFCell cellTiltle = rowm.createCell(0);
        HSSFCellStyle  columnTopStyle  = this.getColumnTopStyle(workbook);
        HSSFCellStyle style = this.getStyle(workbook);
        sheet.addMergedRegion(new CellRangeAddress(0,1,0,(rowName.length-1)));
        cellTiltle.setCellStyle(columnTopStyle);
        cellTiltle.setCellValue(title);

        // 定义所需列数
        int columnNum = rowName.length;
        HSSFRow rowRowName = sheet.createRow(2); // 在索引2的位置创建行(最顶端的行开始的第二行)

        // 将列头设置到sheet的单元格中
        for (int n = 0; n < columnNum; n++) {
            HSSFCell cellRowName = rowRowName.createCell(n); // 创建列头对应个数的单元格
            cellRowName.setCellType(HSSFCell.CELL_TYPE_STRING); // 设置列头单元格的数据类型
            HSSFRichTextString text = new HSSFRichTextString(rowName[n]);
            cellRowName.setCellValue(text); // 设置列头单元格的值
            cellRowName.setCellStyle(columnTopStyle); // 设置列头单元格样式
        }

        // 将查询出的数据设置到sheet对应的单元格中
        for (int i = 0; i < dataList.size(); i++) {

            Object[] obj = dataList.get(i);// 遍历每个对象
            HSSFRow row = sheet.createRow(i + 3);// 创建所需的行数

            for (int j = 0; j < obj.length; j++) {
                HSSFCell cell = null; // 设置单元格的数据类型
                if (j == 0) {
                    cell = row.createCell(j, HSSFCell.CELL_TYPE_NUMERIC);
                    cell.setCellValue(i + 1);
                } else {
                    cell = row.createCell(j, HSSFCell.CELL_TYPE_STRING);
                    if (!"".equals(obj[j]) && obj[j] != null) {
                        cell.setCellValue(obj[j].toString()); // 设置单元格的值
                    }
                }
                cell.setCellStyle(style); // 设置单元格样式
            }
        }
        // 让列宽随着导出的列长自动适应
        for (int colNum = 0; colNum < columnNum; colNum++) {
            int columnWidth = sheet.getColumnWidth(colNum) / 256;
            for (int rowNum = 0; rowNum < sheet.getLastRowNum(); rowNum++) {
                HSSFRow currentRow;
                // 当前行未被使用过
                if (sheet.getRow(rowNum) == null) {
                    currentRow = sheet.createRow(rowNum);
                } else {
                    currentRow = sheet.getRow(rowNum);
                }
                if (currentRow.getCell(colNum) != null) {
                    HSSFCell currentCell = currentRow.getCell(colNum);
                    if (currentCell.getCellType() == HSSFCell.CELL_TYPE_STRING) {
                        int length = currentCell.getStringCellValue()
                                .getBytes().length;
                        if (columnWidth < length) {
                            columnWidth = length;
                        }
                    }
                }
            }
            if (colNum == 0) {
                sheet.setColumnWidth(colNum, (columnWidth - 2) * 256);
            } else {
                sheet.setColumnWidth(colNum, (columnWidth + 4) * 256);
            }
        }
        workbook.write(out);
    } catch (Exception e) {
        e.printStackTrace();
    }

}






    /*
     * 列头单元格样式
     */
    public HSSFCellStyle getColumnTopStyle(HSSFWorkbook workbook) {

        // 设置字体
        HSSFFont font = workbook.createFont();
        // 设置字体大小
        font.setFontHeightInPoints((short) 11);
        // 设置字体名字
        font.setFontName("Courier New");
        // 设置样式;
        HSSFCellStyle style = workbook.createCellStyle();
        // 设置底边框颜色;
        style.setBottomBorderColor(HSSFColor.BLACK.index);

        // 设置左边框颜色;
        style.setLeftBorderColor(HSSFColor.BLACK.index);

        // 设置右边框颜色;
        style.setRightBorderColor(HSSFColor.BLACK.index);

        // 设置顶边框颜色;
        style.setTopBorderColor(HSSFColor.BLACK.index);
        // 在样式用应用设置的字体;
        style.setFont(font);
        // 设置自动换行;
        style.setWrapText(false);
        return style;
    }


    /*
     * 列数据信息单元格样式
     */
    public HSSFCellStyle getStyle(HSSFWorkbook workbook) {
        // 设置字体
        HSSFFont font = workbook.createFont();
        // 设置字体大小
        // font.setFontHeightInPoints((short)10);
        // 字体加粗
        // font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);
        // 设置字体名字
        font.setFontName("Courier New");
        // 设置样式;
        HSSFCellStyle style = workbook.createCellStyle();
        // 设置底边框颜色;
        style.setBottomBorderColor(HSSFColor.BLACK.index);
        // 设置左边框颜色;
        style.setLeftBorderColor(HSSFColor.BLACK.index);
        // 设置右边框颜色;
        style.setRightBorderColor(HSSFColor.BLACK.index);
        // 设置顶边框颜色;
        style.setTopBorderColor(HSSFColor.BLACK.index);
        // 在样式用应用设置的字体;
        style.setFont(font);
        // 设置自动换行;
        style.setWrapText(false);
        return style;

    }
}
